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HowToWork.md

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Basic Logic

  1. eth-contract generate a event on-chain
  2. js generate the event proof data off-chain
  3. call hmy-contract's function ExecProof(proof-data)
  4. hmy-contract verify the proof data then trigger function onXxEvent(...)
  5. vice-versa

for example: eth-contract emit event Locked(A, B, C), and will trigger hmy-contract's function onLockedEvent(A, B, C)

hmy-contract's event also trigger eth-contract's onXxEvent

Init a Bridge

eth to hmy

  1. call eth-contract CreateRainbow()，then will emit event TokenMapReq(...)
  2. trigger hmy-contract function onTokenMapReqEvent(...):
    1. create a new mintable token contract
    2. in the end, emit event TokenMapAck(...)
  3. trigger eth-contract function onTokenMapAckEvent(...), bridge init complete.

hmy to eth

vice-versa

Token CrossChain Transfer

eth to hmy

Token IN

  1. user call ERC20's Approve to approve eth-contract spent their token
  2. user call eth-contract's RainbowTo, it will emit event Locked(...)
  3. trigger hmy-contract's function onLockedEvent(), Toekn-In complete

Token BACK

  1. user call HRC20's Apprve to approve hmy-contract spent their token
  2. user call hmy-contract's function RainbowBack(), it will emit event Burn(...)
  3. trigger eth-contract's onBurnEvent(), Toekn-Back complete.

hmy to eth

vice-versa